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Finding the Fourth Proportional to 860,615.80, 1,187,691.88 and 478,634.38

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Solution

The fourth proportional to 860,615.80, 1,187,691.88 and 478,634.38 is: 660,538.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    860,615.80 : 1,187,691.88 = 478,634.38 : x
  2. Step 2: Convert to fraction form
    860,615.80/1,187,691.88 = 478,634.38/x
  3. Step 3: Cross multiply
    860,615.80x = 1,187,691.88 × 478,634.38
  4. Step 4: Simplify right side
    860,615.80x = 568,470,166,614.83
  5. Step 5: Solve for x
    x = 568,470,166,614.83/860,615.80
  6. Step 6: Final answer
    x = 660,538.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.